Key Financial Data Of Reporting Company
| Concept | 2024-10-01 to 2025-03-31 | As at 2025-03-31 | As at 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-03-31 | As at 2024-03-31 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | 
                                                1,099,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,934,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                986,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | 
                                                341,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                441,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                207,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                1,825,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,569,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,404,439,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | 
                                                2,678,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,493,207,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,279,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | 
                                                40.27
                                                
                                             | — | — | 
                                                50.56
                                                
                                             | 
                                                24.59
                                                
                                             | — | 
| Diluted earnings per share | 
                                                39.65
                                                
                                             | — | — | 
                                                50.22
                                                
                                             | 
                                                24.46
                                                
                                             | — | 
| Equity-to-asset ratio | — | 
                                                0.679
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.626
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.615
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | 
                                                249,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                319,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                198,070,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -4,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                -49,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                149,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                1,435,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,240,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,019,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |